Got this from another board. It's about what the numbers could mean.
4x4=16, 8+8=16, 23-8=15, 42-23-4=15, the maths is driving me crazy!
4 - Sawyer made the b-day wish, Sam the ex navy guy died, Locke was crippled, number of guns in the case, four people at a time digging Jack and Charlie out of the cave, Boone had four inhalers for Shannon, Claire's psychic stalked her for four months, Walt rolls four-three in backgammon, Michaelangelo stared at the block of marble that became David for four months, Locke tied Boone up four miles away from camp, Michael's nurse was a mother of four, 4 people can fit on the raft,
8 - Helen and John talked for eight months, Michael worked eight years in construction, DriveSHAFT was going to tour for eight weeks opening for Meat Coat, Charlie didn't play his guitar for eight days, Claire's 8 months preggers (duh! - I miss the obvious), Shannon was eight when her dad married Boone's mom, Michael sent Walt cards/letters for eight years, 8 people died in a fire at one of Hurley's businesses
15 - Sun was supposed to leave at 11:15, number of main castaways (including Claire's baby as a separate entity), Boone spent fifteen hours flying to rescue Shannon
8/15 - flight number, deposit box number
16 - 16 years ago Sam and Lenny heard transmission, 16 years ago Dannielle and crew heard transmission/crashed/died/changed signal, 16 weeks since lottery was won, 16 hours to find the pilot/cockpit, Jack's first spinal procedure was on a 16 year old girl, when Locke was showing Walt the backgammon game the dice added up to 16, in Sun's flashback, Jack was at the counter and said he had to be back to LA in 16 hours.
23 - The reward for Kate was $23,000, Hurley lost $23,000 to Walt at their first backgammon game
42 - heh - the meaning to life, the universe, everything... (42-day long hiatus! )